I now put it on everything I sell. Only trouble is until you actually
come across something that tries to infect you, there's no clue how
well its working other than the machines performance.
On AV testing websites, it does come out near the top though.

I notice the download file is initially about 5mb, but it does two or three
times that in updates in immediate installation. I hope they periodically
update their download file to incorporate all updates to that date. A
practise done by AVG, Avira, Avast etc

Why would the download include any updates? Isn't it just an installer
stub that goes off to the 'net and downloads all the files it needs to
do the actual install (which I presume would then be current)? I don't
think I've had a full offline install package for AVG since 7.5 or so.